Java interface object

Explanation: Concrete class implements an interface.

An interface in Java is a blueprint of a class. It has static constants and abstract methods.

All methods of an Interface do not contain implementation (method bodies) as of all versions below Java 8 . Starting with Java 8, default and static methods may have implementation in the interface definition.

The implements keyword is used to implement an interface . The interface keyword is used to declare a special type of class that only contains abstract methods. To access the interface methods, the interface must be “implemented” (kinda like inherited) by another class with the implements keyword (instead of extends ).